Rate constants for the gas-phase reaction of C5C10 alkenes with ozone

✍ Scribed by Eric Grosjean; Daniel Grosjean

• Publisher: John Wiley and Sons
• Year: 1995
• Tongue: English
• Weight: 611 KB
• Volume: 27
• Category: Article
• ISSN: 0538-8066
• DOI: 10.1002/kin.550271102

✦ Synopsis

The gas-phase reaction of ozone with C5 -Clo alkenes (eight 1-alkenes, four 1,l-disubstituted alkenes, and cyclohexene) has been investigated a t atmospheric pressure and ambient temperature (285-293 K). Cyclohexane was added to scavenge the hydroxyl radical, which forms as a product of the ozonealkene reaction. The reaction rate constants, in units of cm3 molecule-' s-l, are 9.6 ? 1.6 for 1-pentene, 9.7 ? 1.4 for 1-hexene, 9.4 5 0.4 for 1-heptene, 12.5 ? 0.4 for 1-octene, 8.0 ? 1.4 for 1-decene, 3.8 ? 0.6 for 3-methyl-l-pentene, 7.3 -+ 0.7 for 4-methyl-l-pentene, 3.9 5 0.9 for 3,3- dimethyl-1-butene, 13.3 -f 1.4 for 2-methyl-l-butene, 12.5 5 1.1 for 2-methyl-1-pentene, 10.0 5 0.3 for 2,3-dimethyl-l-butene, 13.7 2 0.9 for 2-ethyl-1-butene, and 84.6 ? 1.0 for cyclohexene. Substituent effects on alkene reactivity are examined. Steric effects appear to be important for all 1,l-disubstituted alkenes as well as for those 1-alkenes that bear s-butyl and t-butyl groups. The results are briefly discussed with respect to the atmospheric persistence of the alkenes studied. @I 1995 John Wiley & Sons, Inc.